A minefield. In no particular order:
You can't use fuel taxed at the rate for non-road use for propulsion. Red fuel can legally run a cab heater or fridge, that's all.
To the opening poster - forget it. Only a major vehicle producer has the remotest chance of getting a product to market and selling it. A small outfit has absolutely no chance - think Reliant Robin vs. Polo.
Common sense dictates that a diesel prime mover in conjunction with grid derived energy is the way to do this. There is some progress in the use of grid energy, but as most meaningful hybrid development is carried out outside Europe, there will be no diesel. A vehicle with a diesel engine in any guise or configuration is too difficult to sell world wide to be a proposition. Ultra low sulphur fuel is not universally available and particulate emissions regulations are set to become more onerous. Some US states effectively ban diesel cars.There is also user resistance to diesel fuel in several large markets.
You might JUST get a diesel hybrid from VAG or PSA but the Japanese have a clear lead at the moment and the Americans will throw "moon money" at it if and when they want to. My view is that despite the obvious advantages of such a vehicle, VAG and PSA won't go there if they've any sense.
A world market is the only one worth considering now. Politics always wins over engineering.
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